import React, {Component} from 'react';
import {withRouter} from 'react-router-dom'

class Header extends Component {
    back = () => {
        this.props.history.goBack()
    }
    forward = () => {
        this.props.history.goForward()
    }
    go = () => {
        this.props.history.go(-1)
    }

    render() {
        return (
            <div className="page-header">
                <h2>React Router</h2>
                <button onClick={this.back}>回退</button>
                <button onClick={this.forward}>前进</button>
                <button onClick={this.go}>Go</button>
            </div>
        );
    }
}

export default withRouter(Header);

//withRouter可以加工一般组件，让一般组件具备路由组件所特有的API
//withRouter的返回值是一个新组件